Răspuns :
7(2x-1)<_ 49
14x-7<_49
14x<_56
x<_4, x=natural, deci x=0,1,2,3,4
6(2x+3)-4<_38
12x+18-4<_38
12x+14<_38
12x<_24
x<_2, x=natural, deci x=0,1,2
14x-7<_49
14x<_56
x<_4, x=natural, deci x=0,1,2,3,4
6(2x+3)-4<_38
12x+18-4<_38
12x+14<_38
12x<_24
x<_2, x=natural, deci x=0,1,2
∅ Rezolvare :
a ) 7( 2x - 1 ) ≤ 49 =>
14x - 7 ≤ 49 =>
14x ≤ 49 + 7 =>
14x ≤ 56 =>
x ≤ 56 : 14 =>
x ≤ 4 =>
S = { 0 , 1 , 2 , 3 , 4 }
b ) 6( 2x + 3 ) - 4 ≤ 38 =>
12x + 18 - 4 ≤ 38 =>
12x ≤ 38 + 4 - 18 =>
12x ≤ 42 - 18 =>
12x ≤ 24 =>
x ≤ 24 : 12 =>
x ≤ 2 =>
S = { 0 , 1 , 2 }